A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.
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Affected Vendors & Products
References
History
Thu, 16 Apr 2026 14:15:00 +0000
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Status: PUBLISHED
Assigner: hackerone
Published: 2021-09-29T00:00:00.000Z
Updated: 2026-04-16T13:53:47.481Z
Reserved: 2021-01-06T00:00:00.000Z
Link: CVE-2021-22946
Updated: 2024-08-03T18:58:26.135Z
Status : Modified
Published: 2021-09-29T20:15:08.187
Modified: 2026-04-16T15:16:44.077
Link: CVE-2021-22946